System, method, and apparatus for video fingerprinting

ABSTRACT

Embodiments of methods, apparatuses, devices and systems associated with video fingerprinting are disclosed.

FIELD

Embodiments relate to the field of video, and more specifically, tovideo fingerprinting.

BACKGROUND

The World Wide Web provides access to a vast amount of information,including video files. Web sites allow users to view and, under somecircumstances, share video files, such as by posting video files forother users to view. Due to the vast amount of information available,processes for identifying similar videos may be desirable. Given thelarge quantity of videos that may be made available on various websites, it may be desirable for web site operators to be able to identifyif one or more video files correspond to one or more other video files.

BRIEF DESCRIPTION OF DRAWINGS

Subject matter is particularly pointed out and distinctly claimed in theconcluding portion of the specification. Claimed subject matter,however, both as to organization and method of operation, together withobjects, features, and advantages thereof, may best be understood byreference of the following detailed description when read with theaccompanying drawings in which:

FIG. 1 is a flowchart of a method or process for generating videofingerprints in accordance with an embodiment;

FIG. 2 is a schematic diagram of a representation of a video file inaccordance with an embodiment;

FIG. 3 is a schematic diagram of one or more video cubes formed from thevideo file in accordance with an embodiment;

FIG. 4 is a schematic diagram of one of the video cubes with a sliceacross multiple frames in accordance with an embodiment;

FIG. 5 is a schematic diagram of the slice of one of the video cubes inaccordance with an embodiment;

FIG. 6 is a flowchart of a method or process for matching video files inaccordance with an embodiment; and

FIG. 7 is a schematic diagram of a system in accordance with anembodiment.

DETAILED DESCRIPTION

In the following detailed description, numerous specific details are setforth to provide a thorough understanding of claimed subject matter.However, it will be understood by those skilled in the art that claimedsubject matter may be practiced without these specific details. In otherinstances, methods, procedures, components or circuits that would beknown by one of ordinary skill have not been described in detail so asnot to obscure claimed subject matter.

Reference throughout this specification to “one embodiment” or “anembodiment” means that a particular feature, structure, orcharacteristic described in connection with the embodiment is includedin at least one embodiment of claimed subject matter. Thus, theappearances of the phrase “in one embodiment” or “an embodiment” invarious places throughout this specification are not necessarily allreferring to the same embodiment. Furthermore, the particular features,structures, or characteristics may be combined in one or moreembodiments.

Video fingerprinting as used herein may refer to a process, system, ormethod for generating one or more identifiers associated with one ormore video files. For example, a video fingerprint may comprise a uniqueidentifier associated with a video file. In an embodiment, the uniqueidentifier may, under some circumstances be used to compare one or morevideo files. For example, a video fingerprint may be useful at least inpart to identify copyright violation or copyright monetization in asystem having user generated content. For example, in a system where auser can upload video content, video fingerprinting may be useful toidentify situations where a user has violated a third party's copyrightwith the uploaded content. In this example, if a user has improperlyincorporated a copyrighted work into uploaded content, a videofingerprint may help to identify the source of the copyrighted work,which may aid in disabling access to user content that improperlyincorporates copyrighted works. In addition, video fingerprinting may beuseful for detecting copyrighted works for other purposes, such as fortracking and distributing royalties for licensed works. In addition,video fingerprinting may be useful for identifying duplicate content. Inthis example, video files may, under some circumstances involvesignificant amounts of storage. At least in part by reducing duplicatecontent a system or process may be able to improve performance or costby reducing the amount storage for saved content. In addition, videofingerprinting may be useful in improving video search engine results,for example, such as by presenting more relevant searches earlier or byidentifying alternate copies of video content. Furthermore, searchresults with similar video fingerprints may be grouped together forpresentation to a searcher. It should, however, be noted that these aremerely examples relating to video fingerprinting and that claimedsubject matter is not limited in this regard.

Video matching, may, under some circumstances, involve a number ofpotential solutions. One potential solution involves extracting one ormore types of data from one or more videos and comparing the extracteddata. Examples of types of extracted data include, but are in no waylimited to, metadata, color data, region data, temporal order data,audio data, motion data, time data, object recognition data, videosequence data, shot boundary data, shot clustering data, sub-sampledshot data, ordinal shot data, or color histograms relating to one ormore key frames, to name but a few examples. In one example, one or morevideos may, under some circumstances, be matched based at least in parton extracted metadata, such as manually or machine generated informationrelating to content of a video. However, this data may be different forsimilar videos depending at least in part on how the videos or the dataitself were produced, which may under some circumstances reduce thelikelihood of similar videos being matched using this data.

For another example, one or more videos may, under some circumstances bematched based at least in part on extracted color data. Furthermore, inthis example, extracted color data may comprise a variety of dataincluding, but in no way limited to color histograms, region histograms,color coherence vectors (CCVs),and ordinal signatures, to name but a fewexamples. For example, a color histogram associated with a video may bebased at least in part on color data extracted from one or more framesof a video. One or more videos may be compared based at least in part ontheir respective color histograms, for example. In this example, adifference between one or more color histograms may be used to compareone or more videos. Furthermore, one or more color histograms may becategorized into one or more bins based at least in part on luminancevalues associated with the histograms. For example, a color histogramswith 32 luminance bins and 16 bins for each chrominance channel may becomputed for one or more frames of one or more videos, such as one ormore videos that may be compared. In this example, a first and secondvideo may be determined to be matches if a comparison of theirrespective color histograms achieves a threshold value. On the otherhand, areas of the videos that do not achieve a threshold value may bedetermined not to be matches. Some circumstances, such as one of thevideos having a degraded quality, may at least in part contribute tovideos being determined not to match that, under other circumstances,would have been determined to match.

In addition, a variety of approaches may be implemented with regard tohow much of one or more videos are compared. For example, extractedfeatures may be compared for all frames of a video, key frames of avideo, sub-sampled frames of a video, or combinations thereof. Forexample, if extracted features for all frames of a video are compared,the comparison, while under some circumstances effective, may becomputationally expensive. For another example, if extracted featuresfrom key frames are compared, the comparison may under somecircumstances, such as lower quality videos with poor shot boundaries orfew potential key frames, be of limited effectiveness. While comparingextracted features of sub-sampled frames may improve performance ofvideo matching, it may, under some circumstances, be computationallyexpensive due at least in part to the number of frames that aresub-sampled for feature extraction and comparison.

One or more of the forthcoming embodiments may address one or more ofthe above described challenges.

In an embodiment, a video file may be treated as a three dimensionalshape, such as a cube of varying lengths for example. For example, thedimensions of the shape may comprise horizontal, vertical, and time. Inan embodiment, a video file may be separated into one or more videocubes, such as by dividing the video file at one or more shotboundaries, as described more fully below, for example. As used herein,a “video cube” may refer to a three dimensional representation of aportion of a video file. In an embodiment, a slice across multipleframes, such as a diagonal slice may be taken from the one or more videocubes.

In an embodiment, a feature vector, or video fingerprint, may be formedbased at least in part on the slice across multiple frames. The videofingerprints may then be stored or indexed for future use, such as inmatching one or more videos corresponding to the video fingerprints, forexample. As used herein, a “video fingerprint” or “video signature” mayrefer to one or more extracted features from a video file or video cubethat, under some circumstances, may be used to identify a video file orvideo cube. Furthermore, the terms video fingerprint and video signaturemay be used interchangeably throughout this document. In an embodiment,a video fingerprint may comprise a representation of one or morefeatures extracted from a video file. For example, a video fingerprintmay comprise a representation of one or more features extracted from theslice across multiple frames of a video cube or video file. It should benoted that although described, at times, in terms of a diagonal slice,claimed subject matter is not limited to diagonal slices and that othershapes may be used for generating a slice across multiple frames of avideo file or video cube. In addition, it should be noted that the sliceacross multiple frames need not include information from every frame ofthe video file or cube. In an embodiment, the extracted features maycomprise color and luminance, for example. It should, however, be notedthat this is merely an example relating to extracted features and thatclaimed subject matter is not limited to this example.

Unless specifically stated otherwise, as apparent from the followingdiscussion, it is appreciated that throughout this specificationdiscussions utilizing terms such as “processing,” “computing,”“calculating,” “selecting,” “forming,” “enabling,” “extracting,”“inhibiting,” “identifying,” “comparing,” “representing,” “modifying,”“receiving,” “transmitting,” “storing,” “authenticating,” “authorizing,”“determining,” “slicing,” “hashing,” “generating” or the like refer tothe actions or processes that may be performed by a computing platform,such as a computer or a similar electronic computing device, that isoperable to manipulate or transform data represented as physical,electronic or magnetic quantities or other physical quantities withinthe computing platform's processors, memories, registers, or otherinformation storage, transmission, reception or display devices.Accordingly, a computing platform refers to a system or a device thatincludes the ability to process or store data in the form of signals.Thus, a computing platform, in this context, may comprise hardware,software, firmware or any combination thereof. Further, unlessspecifically stated otherwise, a process as described herein, withreference to flowcharts or otherwise, may also be executed orcontrolled, in whole or in part, by a computing platform.

FIG. 1 is a flow chart of a method or process in accordance with anembodiment 100. With regard to box 102, a system, apparatus, or processmay construct one or more video cubes from a corresponding video. Forexample, a process, apparatus, or system may represent a video as athree dimensional object, such as an object having a height, a width,and a time component. In this example, the three dimensional object maycomprise one or more frames from a video file arranged, such assequentially, along a time axis. In an embodiment, a process, apparatus,or system may determine one or more shot boundaries within the video.For example, a system, apparatus, or process may employ a shot boundarydetection process, such as a process for implementing Frederic Dufaux'sprocess. For another example, a system, apparatus, or process may employa different shot boundary detection process, such as a color histogramprocess, or an edge change ratio process. As just one further example, adiscussion of shot boundary detection techniques may be found in thearticle “Comparison of video shot boundary detection techniques” by JohnS. Boreczky and Lawrence A. Rowe, J. Electron. Imaging, Vol. 5, 122(1996). In an embodiment, a system, apparatus, or process may calculatean entropy histogram corresponding to respective frames from the video.In addition, a system, apparatus, or process may calculate a cumulativetemporal entropy histogram, based at least in part on the calculatedentropy histograms, at least in part to identify one or more times in avideo if changes in respective entropy histograms appear to indicatethat a shot boundary has been identified. For example, in a least oneembodiment a measure of spatial activity may computed for a frame basedat least in part on a calculated entropy histogram. In an embodiment,entropy for a particular frame may be calculated based at least in parton the following:H(k)=−xΣp(x,k)log 2 (p(x,k))In this embodiment, p(x, k) comprises probability of a gray-level valuex in a luminance histogram of a particular frame k. For example, a highvalue of entropy may indicate a frame with a relatively high spatialcontent. In an embodiment, a frame with a relatively high spatialcontent may tend to have a flat histogram at least in part due to havinga pixel luminance that is spread out amongst a relatively large numberof possible pixel luminance values. In another example, a frame with arelatively low spatial content may tend to have a histogram in which aluminance of a relatively large number of pixels may center aroundsubstantially similar luminance value. In this example, a histogramcorresponding to the frame may have a peak value, which may indicate arelatively low entropy value, for example. For an example, a frameincluding a boat in a lake on a cloudless day may tend to have ahistogram with a relatively large quantity of pixels centering around acolor blue. It should, however, be noted that these are merely examplesrelating to shot boundary detection and entropy values and that claimedsubject matter is not limited in this regard. Under some circumstances,such as if shot boundaries correspond to somewhat smaller than desirablevideo cubes, it may be desirable to merge one or more video cubes priorto proceeding in embodiment 100, for example. For example, a video cubehaving a time component of less than a certain duration, such as 5 to 10seconds, as an example may comprise a candidate for merging with one ormore other video cubes. It should, however, be noted that this is merelyan illustrative example relating to video cube formation and thatclaimed subject matter is not limited in this regard.

With regard to box 104, a system, apparatus, or process may slice one ormore one the video cubes across multiple frames, such as by diagonallyslicing the one or more video cubes, to produce one or morecorresponding image slices. In an embodiment, a diagonal slice maycomprise a slice between two vertices of a video cube, as shown in moredetail below with regard to FIGS. 4 and 5. For example, a diagonal slicemay begin at a top height of a video cube at a beginning time of thevideo cube along a time axis and extend to a lower height of the videocube at an ending time of the video cube along the time axis. In thismanner, a diagonal slice may include information taken from acrossmultiple frames along a height axis and a width axis while alsoincluding information with respect to the video cube along a time axis.In an embodiment, including information from multiple frames, such asalong a time axis, may improve performance of one or more matchingprocesses describe more fully below.

With regard to box 106, a system, apparatus, or process may produce avideo signature or fingerprint based at least in part on an image slice.For example, one or more aspects of an image slice may be extracted atleast in part to form a video signature or fingerprint corresponding toa video cube from which the image slice was formed. In an embodiment,one or more extracted aspects of an image may comprise color, luminance,texture, shape, contrast, motion, object recognition, or a variety ofother features. In one particular embodiment, a color correlogram may beformed based at least in part on an image slice. As used herein, a colorcorrelogram may refer to a table or matrix including color informationand distance information. For example, a matrix entry, such as C(i, j),may correspond to a number of pixels of a color i at a pixel distance dfor a particular color j. For example, other extracted features mayinclude color moment data, a layout histogram, a texture histogram, edgetexture data, Blob data, or corner detection data, metadata, color data,region data, temporal order data, audio data, motion data, time data,object recognition data, video sequence data, shot boundary data, shotclustering data, sub-sampled shot data, ordinal shot data, or colorhistograms relating to one or more key frames, to name but a fewexamples. It should, however, be noted that this are merely illustrativeexamples relating to a video signature or fingerprint and that claimedsubject matter is not limited in this regard.

FIGS. 2-5 are schematic diagrams of a representation of a video file200, along with one or more video cubes formed from video file 200, anda diagonal slice on one of the video cubes in accordance with anembodiment. With regard to FIG. 2, video file 200 may be represented asa three dimensional object having a height, a width, and a timedimension. For example, one or more frames of a video file may berepresented as a sequence of frames along a time axis, thus forming athree dimensional representation of the video file. With regard to FIG.3, video file 200 may be separated into one or more video cubes, such asvideo cubes 202, 204, and 206, for example. As discussed above, videofile 200 may be formed into one or more video cubes based at least inpart on one or more detected shot boundaries within video file 200. Forexample, a shot boundary detection process may be utilized, inconjunction with video file 200, to determine one or more shotboundaries within video file 200. In an embodiment, a system or processmay calculate an entropy histogram corresponding to one or more frameswithin video file 200. In this embodiment, a system of process mayfurther calculate a temporal entropy histogram based at least in partthe calculated entropy histograms corresponding to the one or moreframes. For example, if the temporal entropy histogram shows a changehaving a threshold value at a particular time, a shot boundary detectionprocess may determine that the particular time corresponds to a shotboundary. For example, a calculated entropy histogram value on the orderof 30.0 may indicate that a shot boundary has been detected.Alternatively, for example, a shot boundary may be determined based atleast in part on a threshold number or range of frames, such as 20 to 40frames, with a calculated temporal histogram on the order of 6.Furthermore, as discussed above, a system, apparatus, or process may,under some circumstances, merge one or more video cubes formed based atleast in part on detected shot boundaries. For example, if a one or morevideo cubes formed along detected shot boundaries are below a thresholdlength, such as 5 to 10 second, those video cubes may be merged forfurther processing or analysis, as discussed above.

With regard to FIG. 4, a system, apparatus, or process may slice a videocube, such as video cube 202, across multiple frames, at least in partto form an image slice 210 corresponding to video cube 202. In anembodiment, a slice across multiple frames may comprise a diagonalslice. However, it should be noted that a wide variety of slice shapesmay be used, and claimed subject matter is not limited to any particularshape. In an embodiment, a diagonal slice may comprise one or morepixels extracted from video cube 202 along a diagonal line, as shown inFIG. 4. For example, a diagonal slice may be formed based at least inpart on one or more pixels along a diagonal plane of a video cube. Inthis example, a diagonal plane of a video cube may begin at a height 212at time T1 and end at a height 214 at a time T2. In this particularexample, times T1 and T2 correspond to a beginning time and an endingtime of video cube 202, though it should be noted that other timeswithin video cube 202 may likewise be used. It should also be noted thatother heights within video cube 202 may also be used, and that,accordingly, claimed subject matter is not limited in this regard. Itshould further be noted, again, that a slice across multiple frames maytake a variety of shapes and that claimed subject matter is not limitedto any particular shape.

With regard to FIG. 5, diagonal slice 210 may be represented as an imageslice formed based at least in part on video cube 202. For example,diagonal slice 210 may comprise one or more pixels extracted from videocube 202. In this example, respective pixels may have a number ofproperties including, but in no way limited to, color, brightness, hue,horizontal position, vertical position, and time, for example. In anembodiment, a system, apparatus, or process may form a video signatureor fingerprint based at least in part on one or more aspects of theimage slice. For example, a system or process may extract data relatingto horizontal position, vertical position, color, brightness, hue, andtime from the image slice. In an embodiment, the extracted data may berepresented in a matrix, as discussed above, as a video fingerprintcorresponding to video cube 202. For example, the extracted data maycomprise a color correlogram, as described above, and may be representedby a matrix.

Furthermore, the video fingerprints may be stored in one or moreindexes. For example, the video fingerprints may be subjected to LocalSensitivity Hashing (LSH) function or process, at least in part forsubsequent Approximate Nearest Neighbor (ANN) searching. The LSHfunction or process may be operable to map one or more received values,such as one or more video fingerprints, to a smaller number of valueswith a desirable degree of probability that the similar ones of the oneor more received values will be mapped to a same one of the smallernumber or values, for example. In at least one embodiment, a group ofone or more hashing functions H may be chosen so that the hashingfunctions H coupled with a probability distribution D over hashingfunctions H such that the equationhεHsatisfies the following equationPr _(hεH) [h(a)=h(b)]=φ(a,b)for a plurality ofa,bεU.Additional examples relating to LSH, ANN, k-dtrees and the like may befound in the paper “Near-Optimal Hashing Algorithms for ApproximateNear(est) Neighbor Problem” by Piotr Indyk et al, available athttp://people.csail.mit.edu/indyk/mmds.pdf

With regard to FIG. 6, a candidate video may be received by a videomatching system, apparatus or process, as discussed below with regard toFIG. 7. For example, a user may upload a video file to a web site, suchas a file or video sharing web site. In this example, an uploaded videomay be represented as a three dimensional shape having a height, awidth, and a time dimension. Similar to the process discussed above withregard to FIGS. 1-5, an uploaded video may be separated into one or morevideo cubes. For example, one or more video cubes may be formed based atleast in part on one or more detected shot boundaries, as discussedabove. As discussed above, a slice across multiple frames, such as adiagonal slice, may be taken from one or more of the formed video cubes.Furthermore, a video fingerprint, such as a color correlogram may bedetermined based at least in part on the diagonal slices. In anembodiment, the video fingerprint may be compared to one or morepreviously obtained video fingerprints. For example, one or morepreviously obtained video fingerprints may have previously been stored.In this example, the one or more previously obtained video fingerprintsmay have been operated on by one or more hash functions, as describedabove, prior to storage. The hashed video fingerprints may be stored ina data structure for subsequent look-up. For example, the hashed videofingerprints may be stored in a k-dimensional data structure, such as ak-dimensional tree, at least in part to facilitate identifying similarhashed fingerprints, wherein K could be any positive integer. Forexample, a k-dimensional tree may comprise a space-partitioning datastructure at least in part for organizing a k-dimensional data space. Inthis example, a stored video fingerprint may be represented as a nodewithin a k-dimensional tree structure. As just one example, a treestructure is shown in EPO Publication No. EP0436790 entitled“Multi-dimensional tree structure for the spatial sorting of geometricobjects” of Rajan et al. It should be noted, however, that embodimentsof video fingerprints in accordance with claimed subject matter may bestored or compared without having been operated on by one or more hashfunctions, may be stored other than as a data structure, or may bestored in data structures other than k-dimensional trees. Therefore,claimed subject matter is not limited in these respects.

With regard to box 602, the video fingerprint from the uploaded videomay be compared to one or more previously stored video fingerprints. Forexample, one or more preliminary aspects of the video fingerprint fromthe uploaded video may be compared to one or more preliminary aspects ofone or more previously stored video fingerprints, at least in part toidentify one or more possibly matching video fingerprints. For example,a color correlogram from uploaded video may be added to a k-dimensionaltree representation of previously stored color correlograms. In thisexample, a desirable number of neighbors for a color correlogram fromuploaded video in the k-dimensional tree of color correlograms may beidentified using Approximate Nearest Neighbor Searching. In thisexample, an identified desirable number of neighbor color correlogramsmay be identified as possible matching video fingerprints for furtheranalysis. With regard to box 604, once one or more possibly matchingvideo fingerprints are identified, a more detailed comparison of furtheraspects of the video fingerprints may proceed, such as comparing one ormore luminance or color correlograms corresponding to one or morepossibly matching videos. For example, the video fingerprint from theuploaded video may be compared to additional aspects of the identifiedpossibly matching video fingerprints. With regard to box 606, theuploaded video may be matched to one or more other videos based at leastin part on the above comparisons of the video fingerprint from theuploaded video to previously stored video fingerprints.

FIG. 7 is a schematic diagram of a system 700 in accordance with anembodiment. With regard to FIG. 7, a user may upload a video file, suchas by using computing platforms 702 or 704 in conjunction with anapplication program or interface, such as a web browser, for example.The uploaded video may be transmitted via a network to computingplatform 710. Computing platform 710 may, under some circumstances,transmit the uploaded video to computing platform 712. In an embodiment,computing platform 712 may, as described above, form one or more videocubes from the uploaded video file. In this embodiment, the video cubesmay be formed based at least in part on one or more identified shotboundaries, as described above. Furthermore, computing platform 712 may,as described above, create a diagonal slice from the one or more videocubes. In an embodiment, computing platform 712 may further extract oneor more features from the diagonal slices to form one or more videofingerprints. For example, computing platform 712 may form a colorcorrelogram from the diagonal slices. In an embodiment, computingplatform 712 may transmit the extracted color correlograms to computingplatform 714. Computing platform 714 may operate on the transmittedcolor correlograms with one or more hash functions, such as the LCHdiscussed above. In an embodiment, computing platform 714 may compareone or more preliminary aspects of the hashed color correlograms to oneor more stored hashed video fingerprints, at least in part to identifyone or more possible matching video files. Computing platform 714 maythen compare one or more additional aspects of the hashed colorcorrelograms to one or more additional aspects of the one or more storedhashed video fingerprints corresponding to the one or more possiblematching video files. Based at least in part on these comparisons,computing platform 714 may match the uploaded video file to one or morevideo files. In an embodiment, computing platform 714 may transmit theresults of the comparisons and matching to computing platform 710. In anembodiment, computing platform 710 may perform a variety of tasks basedat least in part on the matching information. For example, if thematching operation determines that the uploaded video file does notmatch any other videos computing platform 710 may allow the uploadedvideo to be posted to a web site, such as a file sharing web site. Inanother example if the matching operation determines that the uploadedvideo file does match one or more other video files, computing platform710 may block the uploaded video file from being posted to a web site.Alternatively, computing platform 710 may mark the uploaded video fileas being a duplicate file. As yet another alternative, computingplatform 710 may update a licensing or royalty file to reflect that alicensed video has been posted so that a party owning one or more rightsin a copyrighted work may be properly compensated. It should, of course,be noted that these are merely illustrative examples relating tomatching video files and that claimed subject matter is not limited inthis regard.

In the preceding description, various aspects of claimed subject matterhave been described. For purposes of explanation, specific numbers,systems or configurations were set forth to provide a thoroughunderstanding of the claimed subject matter. However, it should beapparent to one skilled in the art having the benefit of this disclosurethat claimed subject matter may be practiced without the specificdetails. In other instances, features that would be understood by one ofordinary skill were omitted or simplified so as not to obscure claimedsubject matter. While certain features have been illustrated ordescribed herein, many modifications, substitutions, changes orequivalents will now occur to those skilled in the art. It is,therefore, to be understood that the appended claims are intended tocover all such modifications or changes as fall within the true spiritof claimed subject matter.

The invention claimed is:
 1. A method comprising: identifying one ormore shot boundaries in a source video comprised of multiple frames,wherein said one or more shot boundaries are identified based at leastin part on a determination that a entropy histogram for one or moreparticular frames of said multiple frames has a value greater than athreshold entropy value; slicing a video cube across said multipleframes to produce an image slice, wherein said one or more shotboundaries forms at least one edge of said video cube, said video cubecomprising a time axis, where said image slice has a first pixel heightat a first time on the time axis and a second pixel height at a secondtime on the time axis, said first pixel height being different from thesecond pixel height; and producing a video signature based at least inpart on said image slice.
 2. The method of claim 1, wherein slicing avideo cube across multiple frames comprises diagonally slicing a videocube.
 3. The method of claim 2, wherein said video signature correspondsto said source video.
 4. The method of claim 3, and further comprising:repeatedly applying said constructing, slicing and producing to aplurality of videos to form a plurality of corresponding videosignatures.
 5. The method of claim 4, and further comprising: matchingsaid plurality of videos based at least in part on said plurality ofvideo signatures.
 6. The method of claim 5, and further comprising:blocking one or more videos from distribution based at least in part onsaid matching.
 7. The method of claim 5, and further comprising:licensing one or more videos based at least in part on said matching. 8.The method of claim 1, wherein said producing a video signature based atleast in part on said image slice comprises generating a feature vectorbased at least in part on said image slice.
 9. The method of claim 8,wherein said feature vector comprises a color correlogram based at leastin part on said image slice.
 10. The method of claim 1, whereinidentifying one or more shot boundaries further comprises calculating anaccumulated temporal histogram based at least in part on one or moreentropy histograms.
 11. An article comprising: a non-transitory storagemedium having instructions stored thereon executable by a computingplatform to: identify one or more shot boundaries in a source videocomprised of multiple frames, wherein said one or more shot boundariesare identified based at least in part on a determination that a entropyhistogram for one or more particular frames of said multiple frames hasa value greater than a threshold entropy value; slice a video cubeacross said multiple frames to produce an image slice, wherein said oneor more shot boundaries forms at least one edge of said video cube, saidvideo cube comprising a time axis, where said image slice has a firstpixel height at a first time on the time axis and a second pixel heightat a second time on the time axis, said first pixel height beingdifferent from the second pixel height; and produce a video signaturebased at least in part on said image slice.
 12. The article of claim 11,wherein said instructions are further executable by said computingplatform to slice a video cube across multiple frames by diagonallyslicing said video cube.
 13. The article of claim 12, wherein said videosignature corresponds to said source video.
 14. The article of claim 13,wherein said instructions are further executable by said computingplatform to form a plurality of video signatures by repeatedly applyingthe constructing, slicing and producing to a plurality of videos. 15.The article of claim 14, wherein said instructions are furtherexecutable by said computing platform to match said plurality of videosbased at least in part on said plurality of video signatures.
 16. Thearticle of claim 11, wherein said instructions are further executable bysaid computing platform to produce a video signature based at least inpart on said image slice at least in part by generating a feature vectorbased at least in part on said image slice.
 17. The article of claim 16,wherein said feature vector comprises a color correlogram based at leastin part on said image slice.
 18. The article of claim 11, wherein saidinstructions are further executable by said computing platform toidentify said one or more shot boundaries at least in part bycalculating an accumulated temporal histogram based at least in part onone or more entropy histograms.
 19. An apparatus comprising: a computingplatform to: identify one or more shot boundaries in a source videocomprised of multiple frames, wherein said one or more shot boundariesare identified based at least in part on a determination that a entropyhistogram for one or more particular frames of said multiple frames hasa value greater than a threshold entropy value; slice a video cubeacross said multiple frames to produce an image slice, wherein said oneor more shot boundaries forms at least one edge of said video cube, saidvideo cube comprising a time axis, where said image slice has a firstpixel height at a first time on the time axis and a second pixel heightat a second time on the time axis said first pixel height beingdifferent from the second pixel height; and said computing platformfurther adapted to produce a video signature based at least in part onsaid image slice.
 20. The apparatus of claim 19, wherein said computingplatform is further capable of slicing a video cube across multipleframes by diagonally slicing said video cube.
 21. The apparatus of claim20, wherein said video signature corresponds to said source video. 22.The apparatus of claim 21, wherein said computing platform is furthercapable of forming a plurality of video signatures by repeatedlyapplying the constructing, slicing and producing to a plurality ofvideos.
 23. The apparatus of claim 22, wherein said computing platformis further capable of matching said plurality of videos based at leastin part on said plurality of video signatures.
 24. The apparatus ofclaim 19, wherein said computing platform is further capable ofproducing a video signature based at least in part on said image sliceat least in part by generating a feature vector based at least in parton said image slice.
 25. The apparatus of claim 24, wherein said featurevector comprises a color correlogram based at least in part on saidimage slice.
 26. The apparatus of claim 19, wherein said computingplatform is further capable of identifying said one or more shotboundaries at least in part by calculating an accumulated temporalhistogram based at least in part on one or more entropy histograms. 27.A method comprising: matching one or more videos based at least in parton respective video fingerprints; wherein said video fingerprint isproduced based at least in part on an image slice; wherein said imageslice is produced based at least in part on a slice across multipleframes of a video cube, and one or more shot boundaries forms at leastone edge of said video cube, said video cube comprising a time axis,where said image slice has a first pixel height at a first time on thetime axis and a second pixel height at a second time on the time axis,said first pixel height being different from the second pixel height;and wherein said one or more shot boundaries are identified in a sourcevideo comprised of said multiple frames, and said one or more shotboundaries are identified based at least in part on a determination thata entropy histogram for one or more particular frames of said multipleframes has a value greater than a threshold entropy value.
 28. Themethod of claim 27, wherein said slice across multiple frames a videocube comprises a diagonal slice of said video cube.
 29. The method ofclaim 28, and further comprising: blocking one or more videos fromdistribution based at least in part on said matching.
 30. The method ofclaim 28, and further comprising: licensing one or more videos based atleast in part on said matching.
 31. The method of claim 27, wherein saidvideo fingerprint comprises a feature vector based at least in part onsaid image slice.
 32. The method of claim 31, wherein said featurevector comprises a color correlogram based at least in part on saidimage slice.
 33. A system comprising: means for generating one or morevideo cubes corresponding to one or more portions of a source videocomprised of multiple frames; means for identifying one or more shotboundaries in said source video, wherein said one or more shotboundaries are identified based at least in part on a determination thata entropy histogram for one or more particular frames of said multipleframes has a value greater than a threshold entropy value; means forslicing said one or more video cubes across said multiple frames atleast in part to generate one or more corresponding image slices,wherein said one or more shot boundaries forms at least one edge of saidone or more video cubes, said one or more video cubes comprising a timeaxis, where said one or more corresponding image slices has a firstpixel height at a first time on the time axis and a second pixel heightat a second time on the time axis, said first pixel height beingdifferent from the second pixel height; and means for generating a videofingerprint corresponding to said video based at least in part on theslice across multiple frames of said one or more video cubes.
 34. Thesystem of claim 33, wherein said means for slicing the one or more videoframes across multiple frames is further capable of diagonally slicingthe one or more video cubes.
 35. The system of claim 33, and furthercomprising: means for matching one or more video based at least in parton corresponding video fingerprints.
 36. The system of claim 35, andfurther comprising: means for blocking one or more videos based at leastin part on said matching.
 37. The system of claim 35, and furthercomprising: means for licensing one or more videos based at least inpart on said matching.